I decided to purchase itElector PSP, after a lot of research, even though it's super costly. But now I have enough for me and all my neighbors, and maybe even for all the people in my town! And it worked! I'll never have to worry again; if they get mites, I'll be ready immediately to treat them, their coop and run area, and the mites will be gone. There are so many instances when, through the years, I've settled for the less expensive item, in any respect, and then upgraded. Finally, spending enough money the third time to accomplish what I was trying to do. Now, with good reviews and advice, I buy what works the first time.